Door operating and locking mechanism



June 4; 1968 T1. HERR 3,386,205

DOOR OPERATING AND LOCKING MECHANISM Filed Feb. 15, 1967 9 Sheets-Sheet 1' I I I Maw/1222' @72600072 2677' 3) M f w June 4, 1968 T. z. HERR DOOR OPERATING AND LOCKING MECHANISM 9 Sheets-Sheet 2 Filed Feb. 15, 1967 M a m w W a M Ww m,

m% O HM. o N aw w QN m6 June 4, 1968 T. z. HERR DOOR OPERATING AND LOCKING MECHANISM 9 Sheets-Sheet 5 Filed Feb. 15, 1967 June 4, 1968 T. 2. HERR 3. .205

DOOR OPERATING AND LOCKING MECHANISM Filed Feb. 15, 1967 9 Sheets-Sheet 4 June 4, 196,8 T. z. HERR DOOR OPERATING AND LOCKING MECHANISM 9 Sheets-Sheet 5 Filed Feb. 15, 1967 June 4, v1968 'r. z. HERR DOOR OPERATING AND LOCKING MECHANISM 9 Sheets-Sheet 7 Filed Feb. 15. 1967 Ma a/0r (7750:1872? ,fizw BY W [Java fitarzzw' June 8 T.YZ. HERR 3,386,205

DOOR OPERATING AND LOCKING MECHANISM Filed Feb. 15, 1967 I 9 Sheets-Sheet 8 & .YIIIIIIIIII/IIIIIIII mllllfl/zFnV/l/ 7 m AAMEI, 7

5w 7 I 3 EVIIIJIIIIIIAVIIIIIIIIIIIIIIIIi2%IW l/Illnllauumlllnl i 7 .w/m/ezzar 072606/07'6 fie fawn 5 June 4, 1968 R. 3,386,205

DOOR OPERATING AND LOCKING MECHANISM Filed Feb. 15, 1967 9 Sheets-Sheet 9 Mai/afar Jizoamr 5/6 .5)

dtwmew United States Patent 3,386,205 DOOR OPERATING AND LOCKING MECHANISM eodore Z. Herr, 672 Hyacinth Place,

Highland Park, Ill. 60035 Fil Feb. 15, 1967, Ser. No. 616,221 26 Claims. (Cl. 49-220) ABSTRACT OF THE DISCLOSURE An operating and locking mechanism for a sliding flush door for a railway car. The door is mounted for sliding movement on tracks on the car, and a pair of crank arms are pivotally connected to the upper and lower edges of the door and each crank arm carries a roller assembly which rides on the tracks. The door is locked in place by a series of locking members which are located along the edges of the door.

Both the crank arms and the locking members are operated through an operating mechanism located on the outside of the door. The operating mechanism includes a cam having a spiral groove, and a follower is disposed to ride in the spiral groove as the cam is manually rotated. The follower is connected to a slide, and linear movement of the slide is transmitted to both the crank arms and the locking members in a sequential manner so that on closing of the doors, the crank arms will be initially pivoted to move the door to the closed position and the locking members will be subsequently actuated to lock the door Within the opening.

The invention is directed to an improved sliding flush door construction for a railway car. The door is moved laterally into the door opening in the car and locked within the opening by single movement of an operating mechanism located on the outside of the door. The operating mechanism includes a spiral cam unit which is manually rotated to actuate the door moving mechanism and the door locking mechanism in programmed sequence.

This invention rel-ates to a door operating mechanism and more particularly to a structure for operating and locking a sliding flush door for use on a railway box car or refrigerator car.

Openings in the sides of a box car or refrigerator car are normally enclosed by sliding flush doors which slide in tracks mounted on the sides of the car above and below the door opening. After being moved to a position in alignment with the opening, the door is moved laterally into the opening so that the inner surface ofthe door is flush with the inner surface of the car. The door is then locked in this position. To provide both sliding and lateral movement for the door, the upper and lower ends of the door are pivotally connected to crank arms which carry rollers that ride in the tracks mounted on the car. The crank arms at the upper and lower edges of the door are usually mounted in vertical alignment and are connected to an operating mechanism located on the outside of the door.

In one common type of door operating unit, the crank arms themselves serve not only to move the door laterally into the opening in the car but also function to lock the door within the opening so that no auxiliary locking unit is employed. As the crank arms are connected to the manual operating mechanism through long rods, there is considerable torque on the rods so that an effective lock is not always accomplished.

In another common form of door construction, the

3,386,205 Patented June 4, 1968 ice As the doors haveconsidera-ble weight, it requires a considerable manual force to push the doors laterally in and out of the opening. Moreover, as the crank arms are freely pivotable, the door may tend to ride against the side wall of the car when the door is moved longitudinally along the side wall to expose the opening in the car. Thus, it is usually necessary to employ auxiliary rollers on the side wall of the car to facilitate sliding movement of the door.

The present invention is directed to an improved sliding flush door construction for use on a railway car in which the crank arms and the locking mechanism for the door are both actuated by the single movement of the operating mechanism. More specifically, the door is mounted for sliding movement on the tracks disposed on the side of the car above and below the door opening. A pair of crank arms are pivotally connected to the upper and lower edges of the door and each crank arm carries a roller assembly which rides on the corresponding track to permit the door to be moved longitudinally along the side wall of the car. The vertically aligned crank arms at the top and bottom of the door are connected to vertical drive rods and the rods are rotated to pivot the crank arms by a bell crank meohanism actuated manually by a handle operating through a spiral cam arrangement. Manual rotation of the handle serves to rotate a cam plate having a spiral groove, and a cam follower riding in the spiral groove is attached to a slide plate so that rotation of the handle results in linear movement of the slide plate, Linear motion of the slide plate operates through the bell crank mechanism to rotate the drive rods and thereby pivot the crank arms to move the door laterally in and out of the opening in the railway car. In addition, a second bell crank mechanism is associated with the slide plate and is connected to locking bolts at the top and bottom of the door so that movement of the slide in one direction will move the locking bolts into locking engagement, while movement of the slide plate in the opposite direction will move the bolts to the unlocked position.

The operation of both bell crank mechanisms are programmed so that on opening of the door the initial movement of the slide plate will actuate the second bell crank mechanism to unlock the slide bolts. Unlocking of the slide bolts will release the compression of the door gasket and subsequent movement of the slide plate will then pivot the crank arms to move the door laterally outward of the opening in the side of the car. In closing and locking the door the action is reversed, with initial movement of the slide plate causing the crank arms to pivot to move the door laterally into the opening and subsequent movement of the slide plate operating the locking bolts to lock the door in place and compressing the door gasket.

In a modified form of the invention a toggle mechanism is substituted for the bell crank mechanism and linear movement of the slide plate is transmitted through the toggle mechanism to pivot the crank arms and move the door laterally into and out of the opening in the car side and to sequentially operate the locking bolts.

A provision is made in the construction of the invention to prevent overloading of the crank arms which carry the door. The drive rods which connect the bell crank mechanism with the door supporting crank arms are provided with a spring biased, overload unit. When the crank arms are pivoted to move the door into the opening in the car, the door gasket will engage the door frame and the force required to compress the gasket is designed to be greater than the force required to disengage the overload unit, so that continued rotation of the drive rods by the bell crank mechanism will disengage the overload unit to thereby prevent further torque being applied to the crank arms. Subsequent actuation of the locking bolts serves to gather the door into the opening and compress the gasket.

The door operating construction of the invention serves to move the door laterally into the opening in the railway car, as well as lock the door in position with a single movement of the operating mechanism. The spiral cam drive mechanism which transposes rotary motion of the handle to linear motion for the slide plate is a substantial improvement over prior art drive mechanisms. The spiral cam occupies a small space for the mechanical advantage that it offers and has the additional advantage of not being subjected to spring-back or back-lash. Thus a force applied to the crank arms or door will not rotate or whip the handle back in the opposite direction.

The invention also includes an overload protection unit which prevents the operating mechanism from overloading the crank arms when the door is in the completely closed position.

The door operating unit of the invention is compact and projects outwardly only a few inches beyond the outer surfaces of the door, well within the maximum width requirements for railway cars.

Other objects and advantages will appear in the course of the following description.

The drawings illustrate the best mode presently contemplated of carrying out the invention.

In the drawings:

FIGURE 1 is a fragmentary side elevation of a railway car showing the door construction of the invention as associated with the car;

FIG. 2 is a horizontal section taken along line 22 of FIG. 1;

FIG. 3 is a section taken along line 33 of FIG. 1 and showing the connection of the door to the upper track;

FIG. 4 is an enlarged plan view of the crank arm and roller assembly with parts broken away in section;

FIG. 5 is a view taken along line 5-5 of FIG. 4;

FIG. 6 is an enlarged plan view of the door of the invention with parts broken away and showing the operating mechanism;

FIG. 7 is a section taken along lines 77 of FIG. 6;

FIG. 8 is a section taken along line 8-8 of FIG. 6;

FIG. 9 is a fragmentary plan view showing a locking bolt construction for the side of a car door;

FIG. 10 is a plan view with parts broken away in section showing the locking bolt construction for the bottom of the door;

FIG. 11 is a section taken along lines 1111 of FIG. 10 and showing the lower bolt in the locked position;

FIG. 12 is a view similar to FIG. 11 showing the upper bolt in the locked position;

FIG. 13 is a side elevation of a railway car utilizing a modified form of the door construction of the invention;

FIG. 14 is an enlarged fragmentary plan view with parts broken away in section showing the operating mechanism for the door illustrated in FIG. 13;

FIG. 15 is a section taken along line 15--15 of FIG. 14 and showing the toggle construction;

FIG. 16 is a section taken along lines 16-16 of FIG. 14 and showing the spiral cam arrangement;

FIG. 17 is a section taken along lines 1717 of FIG. 14 and showing the sliding attachment of the toggle arms to the hub;

FIG. 18 is a vertical section of the overload protection unit associated with the crank arms of the door illustrated in FIG. 13;

FIG. 19 is a view taken along lines 19-19 of FIG. 18;

FIG. 20 is a plan view with parts broken away in section of a lower locking bolt for the door construction shown in FIG. 13;

FIG. 21 is a section taken along line 21-21 of FIG. 19 and showing the locking bolt in the unlocked position;

FIG. 22 is a view similar to FIG. 21 showing the locking bolt in the locked position;

FIG. 23 is a section taken along line 23-23 of FIG. 14;

FIG. 24 is a side elevation with parts broken away in section of a modified type of locking bolt;

FIG. 25 is a section taken along line 25-25 of FIG. 24; and

FIG. 26 is a section taken along line 26-26 of FIG. 24.

The drawings illustrate a railway car 1 such as a box car, refrigerator car or grain car, having an opening 2 in the side wall which is adapted to be enclosed by a sliding flush door 3. As best shown in FIG. 2, the side wall of the car 1 is of conventional construction and includes a side post 4 that extends vertically along the opening 2 and a reinforcing member 5 is connected to the side post and extends to the outer surface of the car.

The door 3 includes an outer face 6 and an inner face 7 which are separated by a lightweight insulating core 8. The inner face 7 is provided with an outwardly extending flange 9 and a seal assembly or gasket 11? is mounted on the flange 9 and is in compressed, tight sealing engagement with the flange of member 5 when the door 3 is in the closed and locked position.

The door and door frame construction shown in the drawings is merely illustrative of that commonly employed in railway cars, and it is contemplated that the door operating andlocking mechanism of the invention can be utilized with various other types of door and door frame constructions.

The door 3 is mounted for sliding movement along the side wall of the car 1 on a lower guide rail 11 which is secured to the side wall of the car 1 below opening 2 and an upper guide track 12 is mounted on the side wall of the car '1 above the opening 2. As shown generally in FIG. 1, a pair of roller assemblies 13 are mounted for movement on the lower rail 11, and each roller assembly is carried by one end of a crank arm 14 while the other end of each crank arm is connected to a vertical rod 15. To guide the upper end of door 3 in sliding movement along the side wall of the car, rollers 16 engage the flange 17 of the track 12 and each roller 16 is connected to one end of a crank arm 18. The crank arms 18 are secured to the upper ends of the vertical rods '15. By rotating the vertical rods 15, the corresponding crank arms 14 and 18 will be pivoted about the axes of the rods 15 to thereby move the door 3 laterally in and out of the opening 2.

To look the door in the closed position a plurality of locking units, indicated generally by 19, are connected to vertical rods 20 and an operating mechanism 21 located within the cover 22 attached to the outer surface of the door is operably connected to both the rods 15 and rods 20. The operating mechanism is actuated by rotating a handle 23 and rotation of the handle acts through the operating mechanism 21, as will be hereinafter described, to rotate the rods 15 to thereby move the door laterally with respect to the opening and to move the rods 20 vertically to move the locking members in and out of locking engagement.

Referring to FIGS. 4 and 5, the rail 11 is supported on a bracket 24, which extends outwardly from the car 1 and the upper edge 25 of the rail 11 is generally V- shaped in cross section.

Each roller assembly 13 includes a pair of rollers 26 which are mounted on shafts 27. Rollers 26 are provided both peripheral grooves 28 which receive the V-shaped upper edge 25 of the track 11. The rollers 26 of each roller assembly 13 are housed within a carriage 29 and the shafts 27 are journalled in the opposed side walls of the carriage.

To prevent displacement of the roller assemblies 13 from the rail 11, the rail is provided with a longitudinally extending groove or recess and a bent lip or flange 31 on the inner wall of the carriage 29 is located within the groove. The co-operation of the lip 31 with the groove 30 prevents the roller assemblies 13 from jumping the rail 11.

The central portion of the carriage 29 defines a socket 32 and a pin 33 is disposed within the socket 32. The lower end 34 of the pin has a reduced diameter and extends through an opening in the carriage and is retained within the opening by a lock washer '35. As shown in FIG. 4, pin 33 extends within a recess 36 in crank arm 14 and the upper portion 37 of the pin has a reduced diameter and is threaded within an opening in the crank arm 14. The upper end 38 of the pin is squared for wrench application. To prevent the pin 33 from unthreading, a keeper strip 39 is welded to the upper surface of crank arm 14 and the lower end 40 of strip 39 is forked and engages the end 38.

The upper end of each crank arm 14 is secured to the lower end of the vertical rod 15 and rods 15 are journalled. for rotation within bearing assemblies 41 mounted on the outer surface 6 of the door 3. Each bearing assembly 41 includes a base plate 42 secured to the door face 6 and an outer member 43 which is secured to inner member 42 by a series of bolts 44.

As previously mentioned, each of the vertical rods 15 is rotated to pivot the crank arms 14, by an operating mechanism, indicated generally by 21, and located within the cover plate 22. As the action involved in rotating each of the rods 15 is identical, but opposite, the structure for rotating only one of the rods will be described.

The rods 15 are connected to the operating mechanism 21 through an overload protection unit which prevents excessive torque from being applied to the crank arms 14 and 18 after the door 3 is in the closed position. The overload protection unit, as shown in FIG. 6, includes a collar 46 which is secured to the rod 15 and each collar is provided with a pair of opposed, upwardly extending projections 47 having inclined surfaces 48. A sleeve 49 is journalled around the rod by a bearing 50 and sleeve 49 is provided with a pair of recesses 51 having inclined surfaces 52 which complement and engage the inclined surfaces 48 on the collar 46. A crank arm 53 is connected to the sleeve 49 by a pin 54 and linear movement of the arm 53 is adapted to rotate the sleeve.

To urge the inclined surfaces 52 downwardly against the corresponding inclined surfaces 48, a coil spring 55 is located within a housing 56 and the lower end of the spring bears against the sleeve 49 while the upper end of the spring bears against a collar 57 fixed to the rod 15.

As previously mentioned, linear movement of the rod 53 will rotate the sleeve 49 and thereby rotate the rod 15 through the connection of the inclined surfaces 48 and 52, to thereby pivot the crank arms 14 and 18 and move the door laterally within the opening. When the door moves into the opening, the gasket 10 will engage the door frame member 5 and the compressibility of the gasket is correlated with the force of spring 55 so that the force required to fully compress the gasket 10 is greater than the force exerted by spring 55, with the result that the driving connection of inclined surfaces 48 and 52 will slip or disengage before the door is in its fully closed or gathered position to prevent overloading of the rods 15 and the bell crank drive mechanism. The overload unit will also function to disengage the drive if the door, for some reason, is unable to move when the operating handle is rotated.

As best shown in FIG. 6, the inner end of the arm 53 is pivotally connected to the upper end of 'a bell crank 58 which is pivotaily connected by pin 59 to the Web portion 60 of channel plate 61. The flanges 62 of channel member 61 are connected to the cover plate 22 by a series of bolts 63.

The lower end of the bell crank 58 carries a roller 64 which is adapted to ride within a slot 65 formed in "a slide plate 66 mounted for sliding movement parallel to the outer surface 6 of the door 3. To support the slide plate 66 for sliding movement, a pair of guide rollers 67 are mounted on the web portion 60 of channel plate 61 and engage the upper and lower edges of the slide plate 66.

When the roller 64 rides within the outer straight portion of slot 65, the bell crank 58 will not pivot. Thus, when the slide plate 66 is moved from the solid line position to the phantom line position shown in FIG. 6, the roller 64 will initially ride in the straight portion of slot 65 and then will move downwardly into the curved end 68 of the slot causing the bell crank 58 to pivot about the connection 59 to thereby move the arm 53 and rotate the rods 15 to move the crank arms 14 and 18 and move the door laterally outward of the opening 2 in the side wall of the car. When the slide plate 66 is moved in the opposite direction, to the right as shown in FIG. 6, the roller 64 moves out of the bent end 68 of the slot and the crank arms 14 and 18 are pivoted in the opposite direction to move the door laterally inward into the opening 2 in the car.

The slide plate 66 is moved in the reciprocating path by a spiral cam mechanism. As best shown in FIG. 6, the end of the slide plate 66 is connected to a slide 69 by a series of rivets 70. Guide rollers 71 are located along the upper and lower edges of slide 69 and serve to guide the slide 69 in horizontal sliding movement. The guide rollers 71 are journalled on the web portion 72 of a channel shaped support plate 73. Support plate 73 is provided with a series of flanges 74 and the cover plate 22 is connected to the flanges by bolts.

As previously mentioned, the slide plate 66 is :moved in horizontal reciprocating movement by rotation of a spiral cam 75 which is mounted on a horizontal shaft 76. Shaft 76 is journalled for rotation within an opening in bearing plate 77 secured to the inner surface of cover 22 and Within a bearing 78 mounted within an opening in the web portion 72 of channel plate 73. The shaft 76 is rotated by means of a handle 23 which is attached to the outer end of the shaft. Under normal practice, a suitable locking member, not shown, is secured to the handle and when locked, prevents the handle from being rotated.

The cam 75 is provided with a spiral groove 79 and a cam follower 80, mounted on the end of the slide 69, is adapted to move within the groove 79 as the cam 75 is rotated through operation of the handle 23. As shown in FIG. 6, two followers 80 are mounted within the spiral groove 79, with each follower connected to a slide plate 69 so that movement of each slide plate will act through the bell crank mechanism previously described to operate the crank arms 14 and 18 for the doors.

To guide the slide 69 in a sliding movement, a wear plate 81 made of nylon or other material having a low coefficient of friction is secured to the undersurface of the slide plate 69 and is adapted to ride against the Web portion 72 of channel plate 73 as the slide 69 is moved horizontally by rotation of the spiral cam 75.

To provide a positive step for the closed position of the doors, a lug 82 is secured to the outer periphery of the spiral cam 75 and is adapted to engage a stud or projection 83 on slide plate 69 when the slide plate has been moved inwardly to a predetermined position. As the handle 23 is rotated and the follower 80 moves toward the center of the spiral groove, the slide plate 69 will be moved to the right, as shown in FIG. 6, to a position where the lug 82 will engage the projection 83 and thereby stop further rotation of the spiral ca m.

As shown in FIG. 6, the door is closed and in the locked position. At this time, the roller 64 is at the outer end of the slot 65 and the lug 82 is in engagement with the projection 83 on slide 69. When it is desired to open the door, the cam 75 is rotated counterclockwise through operation of the handle 23. Counterclockwise movement of the spiral cam will move the plate 66 to the left, as shown in FIG. 6, so that the roller 64 will move along the straight section of slot 65 and eventually into the curved end 68 of the slot. When the roller 64 moves into the curved end 68, it will pivot the bell crank 58 to thereby move the door laterally outward of the opening in the car. By rotating the handle 23 clockwise the action is reversed and the door 3 is moved laterally inward into the opening 2.

As previously mentioned, the locking units 19, which serve to gather and lock the door 3 within the opening 2 in the wall of the car after it has been moved laterally inward within the opening, are also activated by the spiral cam operating mechanism 21. As shown in FIGS. -12 the lower locking units 19, which are located along the bottom edge of the door, each include a bolt 84 which is slidable within a housing 85. The housing 85 is provided with a pair of side flanges 86 which are secured by bolts 87 to the outer face 6 of the door 3.

To lock the door 3 to the car, the lower end 88 of each bolt 84 is adapted to engage a bracket 89 mounted on the car beneath the opening 2. The bolts 84 are guided for movement within the housing 85 by a pair of rollers 90 which are mounted on an eccentric shaft 91. Rollers 90 are adapted to ride against an offset section 92 of bolt 84, and the offset section 92 is urged into engagement with the rollers 90 by a leaf spring 93. The rollers 90 are adapted to ride on either side of a central ridge 94 which extends longitudinally along the inner surface of the section 92. By rotating the eccentric shaft 91, the position of the offset section 92, with respect to the outer surface 6 of the door, can be varied to thereby permit the unit to be used with various types of railway ears. For example, in some situations, the relative thicknesses of the door and car wall may vary depending on the particular type of railway car and the use of the eccentric shaft 91 accommodates slight variations in relative thickness by enabling the bolts 84 to be moved laterally with respect to the door.

In addition to the rollers 90, a second pair of rollers 95 are mounted on a pin 96 and are adapted to ride along the upper portion of the bolt 84 on either side of a central ridge 97.

The upper offset end 98 of each lower bolt 84 is pivotally connected to the lower end of a bell crank 99. As best shown in FIGS. 10 and 11, a pin extends through aligned openings in the lower forked end of the crank 99 and through a slot 101 in the end of the bolt 84. The connection of the bolt end 98 to the crank 99 by means of the pin enables the bolt to move laterally inward and outward along the pin 100 to thereby aid in accommodating variances between the outer surface of the door and the outer surface of the car wall in various types of railway cars. For example, if the outer face of door 3 is not flush with the outer surface of the wall of the railway car and is located inward of the car wall, a spacer can be inserted between the locking member and the door face 6 to move the bolt 84 laterally outward, and the upper end 93 of the bolt can float with respect to the lower forked end of crank arm 99 to accommodate the spacer.

As best shown in FIG. 6, the bell crank 99 is pivotally connected to the web 60 of channel plate 61 by a pin 102 and the upper end of hell crank 99 carries a roller 103 which is adapted to ride in a slot 104. The end of slot 104 is curved upwardly, as indicated by 105. When the plate 66 is moved to the left, as shown in FIG. 6, the roller 103 will initially ride within the curved portion 105 of the slot, thereby pivoting the bell crank 99 and movingthe locking bolt 84 upwardly out of locking engagement with the bracket 89. Further movement of the plate 66 will cause the roller 103 to move within the straight portion of slot 104, and movement of the roller within the straight portion of the slot will not cause any further pivotal movement of the bell crank 99.

The upper locking units 19, located at the upper end of the door, are similar to those at the lower end of the door and each locking unit includes a locking bolt 106 having an upper end 107 which is adapted to engage a bracket 108 mounted on the car door above the opening 2. The bolts 106 are adapted to slide within housings 109, similar in structure to housing 85.

The upper locking bolt 106 is provided with an offset section which rides against a pair of rollers 110 mounted on an eccentric shaft 111, similar to the manner in which rollers 90 are mounted on shaft 91. The offset portion of bolt 106 is urged into contact with the rollers 110 by a leaf spring 112.

In addition to the rollers 110, a second pair of rollers 113 serve to guide the bolt 106 for sliding movement within the housing. Rollers 113 are similar in structure to rollers 95 and are mounted for rotation on a shaft 114.

The lower end 115 of bolt 106 is connected to a yoke 116 by a pin 117 so that the lower end 115 can freely move in a lateral direction with respect to the yoke 116 to permit the bolt 106 to adjust for variations in thickness between the door and the side wall of the car.

The yokes 116 are connected to the vertical rods 20 and the rods 20 are mounted for sliding movement within a series of guide brackets 118 secured to the outer surface of the door. To move the rods 20 vertically to engage and release the locking bolts 106, the lower end 119 of rod 20 is pivotally connected to the upper end of a bell crank lever 120 by a pin 121 which extends through a slot 122 in the end 119 of the rod. Bell crank 120 is mounted for pivotal movement on pin 59 secured to the web portion 60 of the channel plate 61 and the lower end of bell crank 120 carries a roller 124 which is adapted to ride in a slot 125. The outer end of slot 125 is curved as indicated by 126.

The locking bolt assemblies 19 at the upper end of the door are in the locked position, engaged with the brackets 108, when the operating mechanism is positioned as shown in FIG. 6. As the spiral earn mechanism is rotated, the slide plate 66 is moved to the left in FIG. 6 causing the rollers 124 to move out of the bent ends 126 of the slot, thereby pivoting the bell crank 120 to move the rods 20 downwardly and release the locking bolts 106. Continued movement of the slide plate 66 results in the roller 124 moving within the straight portion of slot 125 and no further pivotal movement of the bell crank 120 will occur.

When the door operating mechanism is used with a grain car which contains grain or other bulk material, an additional locking element is normally employed along the side edge of the door to prevent the material from bulging the door outwardly. In this regard, a finger 127 is formed integrally with the bell crank 120 and an arm 128 is pivotally connected to finger 127 and extends horizontally through the flange 62 of the channel plate 61. The arm 128 is guided for sliding movement within a guide bracket 129 mounted on the outer surface of the door and the outer end of the arm carries a bolt 130 which is adapted to be received in a bracket 131 in the door frame to lock the door to the frame. As the bolt 130 is connected directly to the bell crank 120, the bolt 130 will be engaged and disengaged along with the engagement and disengagement of the locking bolts 106 at the top edge of the door.

As previously mentioned, the operating mechanism is shown in the locked position in FIG. 6. When it is desired to unlock the door, the handle 23 is rotated moving the spiral cam 75 counterclockwise and this will move the slide plate 66 to the left, as shown in FIG. 6. The initial movement of slide plate 66 will move the rollers 124 and 103 in the curved portions of the respective slots with the result that the bell cranks 99 and 120 are pivoted to release the locking bolts 84, 106 and the side bolts 130. Continued movement of the slide plate 66 will move the rollers 103 and 124 in the straight portions of the respective slots 104 and 125 so that the bell cranks 99 and 120 will not pivot any further. As the slide plate 66 approaches the end of its path of movement, the roller 64 n bell crank 58 will move into the curved end 68 of slot 65, thereby pivoting the bell crank 58 to pivot the crank arms 14 and 18 and thereby move the door laterally outward within the opening. With the door moved outwardly, the door can then be slid manually along the guide tracks to a position where the car can be loaded or unloaded.

To close the door the procedure is reversed, with the initial movement of the slide plate 66 causing the bell cranks 58 to pivot the crank arms 14 and 18 to move the door 3 laterally inward. The pivotal movement of the cranks 14 and 18 will not move the door into flush alignment within the door frame, for the door gasket will engage the door frame and as the force required to fully compress the gasket is greater than the force of spring 55 of the overload unit, the overload unit will disengage to prevent further torque from being applied to the crank arms. Subsequent movement of the slide plate 66 will then cause the rollers 103 and 124 to move into the curved portions of the respective grooves to thereby pivot the bell cranks 99 and 120 and move the locking bolts 84 and 106 into locking engagement with the respective brackets. To wedge or gather the door inwardly into proper locking position, the locking bolts 84 and 106 are provided with tapered ends 132 which initially engage taper surfaces 133 on the brackets 89 and 108, respectively. The engagement of the tapered ends 132 with the tapered surfaces 133 on the locking brackets provides a wedging eifect togather the door laterally inward into proper alignment within the door opening and compress the gasket 10.

FIGS. 13 through 23 illustrate a modified form of the invention. As in the first embodiment, crank arms 14 carry roller assemblies 13 that ride on rail 11, while upper crank arms 18 are connected to rollers 16 that ride on upper track 12. In this embodiment the crank arms 14 and 18 are each provided with extensions 134 which are received within the openings in tubular housing members 135. Each housing 135 is provided with a pair of side flanges 136 which are secured to the outer surface of the door by suitable bolts.

The crank actuating mechanism is identical for both the lower crank arms 14 and the upper crank arms 18 and therefore only the mechanism associated with the lower crank arms 14 will be described in detail.

As illustrated in FIGS. 18 and 19, a collar 137 is located within the housing 135 and is secured to the upper end of the extension 134 by a bolt 138. The lower end of the collar 137 bears against a shoulder formed in the housing and prevents the crank arm 14 from dropping out of the housing. Washer 139 is located between the head of the bolt 138 and the upper end of the extension 134.

The collar 137 is provided with a pair of opposed upwardly extending lugs 140 which are slidably mounted within recesses 141 formed in collar 142. The connection between the lugs 140 and recesses 141 permits axial movement between the members, yet provides a positive rotational connection between the collar 137 and the collar 142.

A spring 143 is located within the interior of collar 137 and bears between the washer 139 and the upper end of the collar 142, thereby urging the collar 142 upwardly within the housing 135.

The collar 142 is provided with a pair of opposed lugs 144 having inclined edges 145 that are in engagement with corresponding inclined edges of recesses 146 formed in the bottom end of a cam cylinder 147. Carn cylinder 147 is journalled for rotation Within the housing 135 by a bearing 148 and is provided with cam slots 149 while the lower end of the cam slot is straight as indicated by 151.

The cam cylinder 117 serves to transform linear motion into rotary motion for the crank extension 134 to thereby pivot the crank arm 14 about the axis of the extension 134. As shown in FIGS. 18 and 19, a rod 152 extends within an opening in the upper end of the housing and carries a pair of rollers 153 adapted to ride in the cam slots 149. The rollers 153 are journalled on shaft 154 which extends transversely through the lower end of the rod 152. Rod 152 is adapted to be moved linearly, and as the rod is moved downwardly from the position shown in FIG. 18, the rollers 153 ride in the spiral end of cam slot 149, thereby serving to rotate the cam cylinder 147 and this rotation is transmitted through the couplings 142 and 137 to thereby rotate the crank arms 14. Continued downward movement of the rod 152 moves the rollers 153 into the straight portion 151 of the spiral cam, and when the rollers 153 ride downwardly within the straight portion 151, no further rotation of the cam cylinder 147 and crank arm 14 will result.

As in the case of the first embodiment, the engagement of the inclined edge 145 on lug 144 with the inclined edge of recess 146 serves as an overload protection which prevents damage to the operating mechanism in instances where the door cannot be moved laterally into the closed position, or in instances of sudden stopping or starting where the door pivots by inertia with respect to the crank arms. If the crank arms cannot be pivoted, rotation of the cam cylinder 147 will cause the inclined edge of recess 146 to ride upwardly on the inclined edge 145 of lug 44 against the force of spring 143 to thereby provide an overload protection which will prevent transmission of the torque to the crank arms. Similarly, if the crank arms 14 are pivoted by sudden movement of the arm, this rotation of crank arm extensions will be taken up by the overload unit so that the rotational force will not be transmitted back to the operating mechanism.

The ends of the rods 152 are connected by a yoke 155 to vertical rods 156, and the rods 156 which are associated with the crank arms 18 at the upper end of the door are guided for vertical movement within guide brackets 157 attached to the outer surface of the door.

Rods 156 are adapted to be moved vertically to pivot the crank arms by a toggle mechanism, indicated generally by 158, and housed within a cover plate 159 secured to the outer surface of the door.

Movement of the rods 156 also acts to engage and release locking bolts at the upper and lower edges of the door. As best shown in FIG. 13, each yoke 155 also carries a rod 160 which extends within an opening in the upper end of a housing 161 having side flanges 162 connected to the outer surface of the door by bolts 163. The lower end of rod 160 is connected to a yoke '164 by a pin 165 and the lower end 166 of yoke 164 is pivotally connected by a pin 167 to the upper end of a locking bolt 168 which is mounted for movement within the housing 161.

To guide the bolt 168 in movement Within the housing, a pair of rollers 161 and 179 are journalled within the housing on opposite sides of the bolt 168. Mounted in opposition to the roller 169 is a ridge 171, while a second ridge 172 is formed in the housing 161 and is located generally opposite the roller 170. The lower end of each bolt is adapted to be moved into locking engagement with a bracket 173 mounted on the side wall of the car adjacent the door opening. As in the case of the first embodiment, the end of each bolt 168 is provided with a tapered surface 174 which is adapted to wedge against 'a tapered surface 175 formed on the bracket 174 to thereby wedge the door inwardly within the opening in the car.

FIG. 20 shows the locking bolt 168 in the unlocked or released position. As the rod 166 is moved downwardly, the bolt 168 will ride downwardly over the rollers 169 and until the lower end 174 engages the tapered surface on bracket 173. Continued downward movement of the locking bolt 168 will wedge the end of the bolt within the bracket 173 to gather the door inwardly within the opening.

The bolt movement is provided with a double cam action. As the bolt 163 is moved downwardly, the shoulder or projeceion 176 on bolt 163, engages rib 172, thereby camrning the bolt inwardly toward the door so that the end 174 of the bolt will engage the latch surface 175. A second camming action is provided as the inner surface of bolt 16% rides against the roller 176 and this second carnming action multiplies the first, so that, in effect, an overall camming action is provided which is equivalent to that which could only be produced through the use of a considerably thicker bolt subjected to a single camming action. Thus, the construction of the invention provides a maximum camming action to bring the bolt into engagement with the latch with a minimum bolt thickness.

The upper actuating rods 156 are slidable within housings 177 mounted within the cover 159 on the outer face 6 of door 3. Each of the housings 177 is provided with a pair of side flanges 17 8 which are connected to the door face 6 by bolts 179.

The lower end of each of the upper actuating rods 156 is pivotally connected to a toggle arm 138 by a pin 181. In addition, 'a roller 182 is mounted on the pin 181 and is adapted to ride in a vertical track 183 formed in the housing 177.

The opposite or lower end of toggle arm 1% is pivotally connected to a toggle arm 184 by a pin 185 and, as is best shown in FIG. 17, the head of the pin 135 is adapted to slide within a vertical slot 186 formed in hub 187.

The lower end of toggle arm 184 is pivotally connected to the housing 188, which is similar in structure to housing 177, so that the lower end of toggle arm 184 is fixed with respect to the door 3.

The operating mechanism also includes a second pair of toggle arms 189 and 190. The upper end of toggle arm 189 is pivotally connected to housing 177 and the lower end of arm 189 is pivotally connected to arm 196 by a pin 191. The head of pin 191 rides within the slot 1% in hub 187, as shown in FIG. 17. The lower end of toggle 'arm 19%) is pivotally connected by pin 192. to the upper end of the lower actuating rod 156. In addition, a roller 193, similar to roller 182, is mounted on pin 192 and is adapted to ride within a vertical track 194 formed in housing 18%.

FIG. 14 shows the operating mechanism in the unlocked position. To pivot the crank arms 14 and 13 and move the locking bolts 169 into locking position, the hub I 187 is moved to the left as shown in FIG. 14. At the lower end of arm 184 is fixed at pivotal connection 192, and as the upper end of arm 1% is free to move vertically, the arms 180 and 18-4 will move to an extended position, as shown by the phantom lines in FIG. 14, to

thereby move the upper rod 156 upwardly. Pivot pin 185 will slide vertically upward within slot 186 to accommodate the extension of toggle arms 18% and 134. Similarly, movement of the hub 187 will extend the toggle arms 189 and 190, as shown by the phantom lines in FIG. 14, to move the lower rods 1% downwardly. The pivot pin 191 connecting arms 189 and 1% will slide vertically downwardly within the slot 186 to accommodate the extension of the toggle arms 189 and 1%.

As previously described, vertical movement of rods 156 will act through yokes 155 to actuate rods 152 and 160. Initial movement of rods 152 will move rollers 153 into the spiral portion 151? of slot 149 to thereby pivot the crank arms 14 and 13 and move the door laterally into the opening. Continued movement of rods 152 will cause rollers to ride within the straight portions 151 of slots 149 and no further pivotal movement of the cranks 14 and 18 will occur.

The movement of rods 1611 which actuate the locking bolts 168 is synchronized with the movement of rods AMA 152, so that the locking bolts will not move into engagement with the locking brackets 173 until after the rollers 153 have moved out of the spiral portions 159 of slots 149. This insures that the door will be moved laterally into the opening in the car before the locking bolts are engaged.

To unlock the door, the action is reversed with initial movement of the actuating rods 156 functioning to release the locking bolts 163 and subsequently pivoting the crank arms 14 and 18 to move the door laterally outward of the opening in the car.

Hub 187 is connected to a horizontal rod 195 which extends through a stop bracket 11% mounted on door face a. The bracket 195 provides a stop to limit the movement of the hub 187 and thereby preventing the toggle arms from being extended more than over center. For grain cars, a slide bolt, similar to bolt 130, can be connected to rod 195, if desired, and the slide bolt will engage a bracket mounted on the car as the rod 195 is moved to the left in FIG. 14.

The opposite end of hub 187 is connected to a horizontal rod 197 which is secured to the outer end of a slide 198. Slide 198 carries guide bars 199 which are adapted to ride on the downwardly bent flanges 20d of a channel bracket 261 mounted on door face 6. The engagement of the guide bars 199 with flanges 206 guides the slide 193 in horizontal linear movement.

As in the case of the first embodiment, the slide 198 is moved linearly by a spiral cam mechanism. A cam follower 2132 is connected to the inner end of the slide 198 and follower 2112 is adapted to ride within a spiral groove 203 formed in the cam 204. As in the case of the first embodiment, the spiral cam 2% is adapted to actuate a pair of toggle mechanisms 158, only one of which is shown in FIG. 14. Thus, both the outer and inner surface of cam 264 is provided with a spiral groove 203 and a follower 2G2 rides in each groove 203.

To rotate the cam plate 294, a handle 2G5 is mounted on the square outer end 206 of a shaft 207 which is connected centrally to the cam 264. The handle is located on the outside of the cover 159 and by rotating the handle, the cam plate 204 is correspondingly rotated to move the followers 202 in the grooves 203 and thereby move the slide plates 198. In practice a suitable locking mechanism, not shown, is associated with the handle 205 to prevent tampering with the same.

As shown in FIG. 16, the door face 6 is recessed, as indicated by 2118, and the generally square inner end 209 of the shaft 207 is located within the recess. By providing a suitable opening in the door 6, a wrench or other operating tool can be engaged with the end 209 of the shaft to rotate the cam plate and open the door from the inside of the car if desired.

FIGS. 24-26 illustrate a modified form of locking bolt construction. While FIGS. 24-26 show only the locking bolts at the lower edge of the door, the bolts at the upper edge of the door are identical in structure and operation. In this embodiment, the bolts 210 are guided for sliding movement within housings 211 mounted on the outer face of the door 3. The upper end of each bolt 210 is pivotally connected by pin 212 to the lower forked end 213 of link 214, while the upper end of the link is ivotally connected by pin 215 to the lower end of a link 216. To move the bolt 210 within the housing, the upper end of link 216 is pivotally connected by pin 217 to the lower end of bell crank 99.

The lower end 218 of bolt 216 is adapted to be received within a locking bracket 219 secured to the car wall 1 and, as in the case of the previous embodiments, the lower edge of the bolt is tapered, as indicated by 226, and is designed to wedge against a correspondingly tapered surface 221 on bracket 219 to aid in gathering the door inwardly as the bolt moves downwardly.

To provide a cumming action for the bolt operation, a projection or shoulder 222 extends outwardly from each side edge of the bolt 210. The shoulders 222 are adapted to slide between an inner cam member 223 and an outer cam member 224. In FIG. 26, the phantom lines indicate the location of the cam shoulders 222 when the bolt 210 is in the upper unlocked position. As the bolt moves downwardly through pivotal movement of bell crank 99, the tapered outer edge 225 of shoulder 222 engages the sloping surface 226 of outer cam member 224 to move the bolt 210 laterally inward toward door 3 and enable the lower end 218 of the bolt to get position to enter the locking bracket 219. Continued downward movement of the bolt 210 will bring the surface 227 of cam shoulder 222 into engagement with the sloping surface 228- of inner cam member 223 and as surface 227 of shoulder 222 rides along the sloping surface 228, the door is wedged inwardly to provide a second gathering action to fully compress the door gasket 10. Thus, the bolt construction of FIGS. 24-26 provides a maximum overall camming action with a minimum bolt thickness to gather the door 3 into the opening 2 and compress the door gasket 10.

The door construction of the invention serves to move the door laterally into the opening in a railway car, as well as lock the door in position within the opening with a single movement of the operating mechanism. The operating mechanism is programmed so that the door is initially moved laterally into the opening and then the locking mechanism is then actuated to lock the door in position. On opening of the door, the procedure is reversed so that rotation of the handle initially releases the locking members and then moves the door laterally outward of the opening.

The spiral cam drive mechanism is compact and projects only about 2. /2 inches from the outer surface of the door well within the maximum width requirements for railway cars. The spiral drive mechanism has the additional advantage of not being subjected to springback so that a force applied to the crank arms or door will not rotate or whip the handle back in the opposite direction.

The door operating mechanism is extremely versatile and can be used with various types of doors and railway cars. To accommodate variances in relative thickness between the door and the side wall of the car, a provision is made to vary the lateral position of the locking assemblies with respect to the outer face of the door.

While the above description is directed to the use of the door operating mechanism for a railway car door, it

is contemplated that the operating mechanism can also be employed for operating doors used in other applications.

Various modes of carrying out the invention are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.

I claim:

1. A closure apparatus, comprising a structure including a wall having an opening therein, a door to enclose the opening and having a closed position in which the door is located within the opening and having an open position in which the door is disposed laterally outward of said opening, pivotal means connected to the upper and lower ends of the door for supporting the door in pivotal movement between said open and closed positions, locking means for locking the door in the closed position, a cam plate mounted on the outside of the door and having a spiral groove, means for rotating said cam plate, a follower disposed to ride in said spiral groove, slide means connected to the follower and mounted for linear movement in a plane generally parallel to the door, and connecting means connecting the slide means to both said pivotal means and to said locking means, rotation of said cam plate causing said slide means to move linearly and said connecting means being arranged so that linear movement of said slide means in one direction is initially transmitted to said pivotal means tomove the door laterally to the closed position and is subsequently transmitted to said locking means to lock the door in the closed position.

2. The apparatus of claim 1 wherein said spiral groove is provided with at least two 360 convolutions.

3. The apparatus of claim 1 in which the cam plate is disposed generally parallel to said door and said means for rotating said cam plate comprises an operating handle connected to said plate.

4. The apparatus of claim 1 in which said pivotal means comprises a plurality of crank arms at the upper and lower ends of the door, one end of each crank arm being pivotally connected to the door and the opposite end of each crank arm being pivotally connected to said wall.

5. The apparatus of claim 4, and including a pair of guide tracks with one guide track being mounted on said wall above said opening and the second track being mounted on said wall below said opening, and a plurality of guide members to ride on said tracks, said opposite ends of said crank arms being pivotally connected to said guide members, said guide members and tracks enabling said door, when in the open position, to be moved generally parallel to said Wall to expose the opening in said wall.

6. The apparatus of claim 5 in which said guide members comprise a series of rollers, said second track having an upstanding longitudinal ridge and the rollers disposed to ride on said second track having a circumferential depression to receive said ridge.

7. The apparatus of claim 5 in which the inner side of said second track is provided with a longitudinal groove facing inwardly toward said Wall, and the guide member disposed to ride on said second track is provided with an outwardly extending member located within said groove and serving to prevent displacement of said guide member from said second track.

8. The apparatus of claim 1 in which said locking means comprises a series of bolts mounted for sliding movement of said door, and a series of latching brackets mounted on said wall and disposed to receive said bolts to lock the door in the closed position.

9. The apparatus of claim 1, in which said connecting means comprises a first bell crank mounted for pivotal movement in a plane parallel to the plane of movement of said slide means, one end of said bell crank being connected to said slide means and the opposite end of said bell crank being operably connected to said pivotal means, and a second bell crank mounted for pivotal movement in a plane generally parallel to the plane of movement of said slide means, one end of said second bell crank being connected to said slide means and the opposite end of said second bell crank being operably connected to said locking means.

10. The apparatus of claim 1 and including means to limit the rotation of said cam plate.

11. The apparatus of claim 10, in which said last named means comprises a projection disposed on the outer periphery of said cam plate, said slide having an abutment on the end thereof facing the center of said cam plate, said projection adapted to engage said abutment as the cam plate is rotated to thereby limit the rotation of the cam plate.

12. The apparatus of claim 1 in which said cam plate has a spiral groove on each face thereof and a follower is disposed to ride in each spiral groove, said apparatus also comprising slide means connected to each follower and mounted for linear movement in a plane generally parallel to the door, and connecting means connecting each slide means to said pivotal means and to said looking means.

13. The apparatus of claim 1 and including means connected to the cam plate and located on the inner surface of the door to rotate the cam plate from the interior of said wall.

14. A closure apparatus, comprising a frame including a wall having an opening therein, a door to enclose the opening and having a closed position in which the door is located within the opening and having an open position in which the door is disposed laterally outward of the opening, pivotal means connected to the upper and lower ends of the door for supporting the door in pivotal movement between said open and closed positions, operating means located on the outside of the door and operably connected to said pivotal means, said operating means being arranged when being moved in one direction to actuate said pivotal means and move the door to the closed position, and said operating means being arranged when moved in the opposite direction to actuate said pivotal means and move the door to the open position, and slip clutch means for disengaging the connection between said pivotal means and said operating means when the load on said clutch means exceeds a predetermined value.

15. The apparatus of claim 14, in which said operating means includes a slide mounted for horizontal movement on the outer surface of the door, and said clutch means includes a first rotatable member having a circumferentially extending inclined surface, connecting means interconnecting the slide and the first rotatable member for transposing linear movement of the slide to rotary motion for said first rotatable member, said clutch means also including a second rotatable member connected to said pivotal means and having a circumferentially extending inclined surface disposed in engagement with said first named inclined surface, and resilient means for biasing said inclined surfaces together.

16. The apparatus of claim 15, in which said connecting means comprises a bell crank mounted for pivotal movement in a plane parallel to the plane of movement of said slide, one end of said bell crank being connected to the slide and the opposite end of said bell crank being connected to said first rotatable member.

17. In a sliding flush door construction having a door to enclose an opening in a wall and having pivotal means connected to the upper and lower ends of the door for supporting the door in pivotal movement between open and closed positions and having locking means for locking the door in the closed position, the improvement comprising slide means mounted on the door for horizontal sliding movement in a plane generally parallel to said door, means for moving the slide means in horizontal movement, said slide means having a first slot and a second slot therein, a first bell crank mounted for pivotal movement on the door in a plane generally parallel to the plane of movement of said slide means and having one end operably connected to said pivotal means and having the opposite end disposed to ride within said first slot, a second bell crank mounted for pivotal movement on the door in a plane parallel to the plane of movement of said slide means and having one end operably connected to said locking means and the opposite end disposed to ride in said second slot, said slots being arranged with respect to each other so that said pivotal means is initially actuated by movement of the slide means in one direction to thereby move the door laterally into said opening and said second bell crank is thereafter pivoted to actuate said locking means to lock the door within the opening.

18. The apparatus of claim 17 in which each slot is provided with a generally horizontal section and a curved section located at the end of said horizontal section.

19. The apparatus of claim 18 in which the curved section of said first slot is located toward one end of said slide means and the curved section of said second slot is located toward the opposite end of said slide means.

20. The apparatus of claim 17, and including a locking member located along the side edge of the door and disposed to engage a locking bracket on said wall, a

15 projection formed on said second bell crank, and third connecting means connecting said projection with said locking member whereby pivotal movement of said second bell crank acts to engage and disengage said looking member with said brackets.

21. A closure apparatus, comprising a frame including a Wall having an opening therein, a door to enclose the opening and having a closed position in which the door is located Within the opening and having an open position in which the door is disposed laterally outward of the opening, pivotal means connected to the upper and lower ends of the door for supporting the door in pivotal movement between said open and closed position, locking means for locking the door in the closed position, operating means located on the outside of the door and operably connected to both said pivotal means and to said locking means, movement of said operating means in one direction acting to operate said pivotal means and move the door to the closed position and engage said locking means, and movement of said operating means in the opposite direction acting to release said locking means and operate said pivotal means to move the door to the open position, means for delaying engagement of the locking means When said operating means is moved in said first named direction until said pivotal means has been operated and said door is in the closed position, means for delaying operation of said pivotal means when said operating means is moved in the opposite direction until said locking means has been released, and an overload protection mechanism operably connected between said operating means and said pivoted means for disengaging said operating means when the load on said operating means exceeds a predetermined value.

22. A closure apparatus comprising a door frame member defining an opening, a door member to enclose the opening and having a closed position in which the door member is located within the opening and having an open position in which the door member is disposed laterally outward of said opening, a compressible sealing element carried by one of said members and disposed to be compressed by the other of said members when the door member is in the closed position to seal the joint between the members, pivotal means for supporting the door member in pivotal movement between said open and closed positions, operating means operably connected to said pivotal means for operating said pivotal means and moving the door member from the open position to a partially closed position whereat the sealing element seals said joint and is in a substantially uncompressed condition, overload means operably connected to said operating means and arranged to disengage said operating means when the operating means is subjected to a given load, said sealing element having a compressibility such that the force required to substantially fully compress said sealing element is greater than said given load whereby said overload means acts to disengage said operating means before said sealing element is substantially fully compressed, and gathering means separate from said pivotal means for moving the door from the partially closed position to said closed position and substantially fully compressing said sealing element.

23. The apparatus of claim 22 in which said gathering means comprises a plurality of slide bolts connected to the door member, and a plurality of latching elements mounted on the door frame and disposed to receive said slide bolts.

24. The apparatus of claim 23, and including cam means associated with said bolts for wedging the bolts inwardly as said bolts are received in said latching elements to gather the door member into said opening and compress said sealing element.

25. The apparatus of claim 22 in which said sealing element comprises a resilient gasket carried by the door member.

26. The apparatus of claim 22, in which said gathering means is operably connected to said operating means and is arranged to operate sequentially With respect to said pivotal means whereby initial movement of said operating means to actuate said pivotal means to move the door member to said partially closed position and further movement of said operating means actuates said gathering means to move said door member to the closed position.

References Cited UNITED STATES PATENTS KENNETH DOWNEY, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,386,205 June 4, 1968 Theodore Z. Herr It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3, line 28, "surfaces" should read surface Column 4, line 70, "both" should read with Column 11, line 5, "projeceion" should read projection line 49, "169" should read 168 Column 14, line 40, "of", first occurrence, should read on Signed and sealed this 16th day of December 1969.

(SEAL) Attest:

Edward M. Fletcher, Jr. WILLIAM E. SCHUYLER, JR.

Attesting Officer Commissioner of Patcnra 

